Variable-speed mechanism.



No. 806,190. y PATENTED-DEOi5,1905 R. E-. ROSEWARNE...

VARIABLE SPEED MECHANISM. APPLICATION FILED 817M229, 1904.

a sums-sum 1.

A PATEATTED DEC. 5, 1905. R. E. EOSE'WAENE. VARIABLE SPEED MECHANISM.

APPLICATION FILED sEPT.29. 190A.

' s SHEBTSWSHEET s.

Q/Vihwano attouwus NI ED-smarts Specification of Letters I Pate nt.

- Patented Dec. 5, 1905.

Application filed fieptember 29,1904. Serial to. 226.502.

.To all whom it may concern.

Be it known that I, RICHARD E. Rosef WARNE, a citizen of the United States, residing at Covington, in the county of Kenton :and State of Kentucky, have invented certain new and'useful Improvements in Variable- Speed Mechanisms, of which the following is ,a specification.

My invention relates .to variable-speed -mechanisms; and it has for its object to provide a mechanism of this kind in which any speed within two given points may be ob-. tained and thedriving connection between gthe parts will be positive.

Other objects and advantages will appear in the following description and will be par-E ticularly pointed out in theclaims.

In the drawings, Figure 1 is aside view of one embodiment of my invention, partly in' section. Fig. 2 is an end view of the embodiment shown in Fig. 1, away. Fig. 3 is a detai view showing the shape of the conical spirally-interrupted gear" if spread upon a flat surface. Fig. 4 is a side view of another embodiment of my invention, partlyin section. Fig.5 is an endviewjof the'embodiment'shown-in Fig. 4. Fig. 6

is a detail view showing the shape of the mu-i -ti lated gear shown in Fig. 4if spread upon a@ flat surface, and Fig. 7 is a detail view of one;

of the pinions.

Referring more particularly to the draw ings, 1 ind1cates adriving shaft, which is ournaled in a fixed bracket 2, and its free end 4 projects into and is journaled in a driven shaft 5, journaled in a fixed bracket 6. J ournaled in andconnecting the brack-i ets 2 and 6 and surrounding the driving-g. shaft 1 are a number of shafts 7, each of .Which has rigidly secured thereto against relative axial and rotary movement a pinion 8, which meshes with a lar e gear 9 :on they driven shaft. Also mounte on to turn with each of the shafts 7 is-a slidable or shiftable pinion 10, the"shaft- 7 being non-circular throughoutthe greater portion of its length to provide for the sliding movement and vent the relative rotary movement. 3

Each pinion 10 is shifted on its shaft 7 byv means of a screw11,journaled at each end in one of the brackets and working through a,

. threaded yoke 12, which embraces the pmrotated in synchronism by means of pinions ion 10 and inthe arms of which the journals} 13 are mounted. e The screws 11 of each of the pinions lO'are arts being broken 14', one keyed to each "screw and meshing with a gear 15,,journaled on-the bracket 2.

Secured to the driving-shaft 1 is a circumferentially-interrupted change-speed gear,

which gradually decreases in circumference and number of teeth from one end to the other, being preferably mounted on a cone 17. In Figs. 1, 2, and 3 this varying gear comprises a conical spiral engagin 18, consisting of teeth 19 which gradually decrease in number, but are the same size in cross-section throughout the s iral to enable the pinions 10 to engage with t em.

. In the embodimentshown in Figs. 4, 5, and

6' the circumferentially-interrupted change spe'edgear' comprises an engaglng portion 18 on an inclination extending throughout the len th of the gear around a portion of its circumf throughout their length. I

In both embodiments the pinions 10 are movable on the shafts 7 in lines parallel with the engaging portions of the circumferentially-interrupted gears, and in Figs. 4, 5, and

6 are provided with teeth approximately diamond shape in'plan view to conform to the angles of inclination of the engagingportions.

The operation of 'theinventlon is as follows In the embodiment shown in Fig. 1, with the 8 5 pinions 10 in the position there shown and the change-speed gear rotating in the direction-of the arrow, it will be seen that the upper pinion 10 will be entering upon the engaging portion'18 before the lower pinion 1Q 90. leaves the same. Oonsequentlythere is always one of the pinions 10 in full engagement with I theengaging portion 18, and as both of-the pinions 10 are geared by pinions 8 to the large gear 9 this gear and the driven element 5 5 will be in constant rotation. By the adj ustment shown the driven element 5 is given its greatest'speed, and if it is desired to reduce this speed the gear 15 is rotated by any suit} 7 able means and all of thef-eed-screws are ro- I00 tated to shift the 'inions 10 over the mutilated change-spec gear, thereby securing a- 1 smaller driving circumference and number of teeth on the change-speed gear, and consequently reduced speed. Owing to the form IO 5 of the chan e-speed gear in this embodiment, only two pmions 10 are required, and each pinion 10 while out of engagement is constantly rotated through its pinion 8 and 5 thereby is always inposition when engaging no the change-speed gear again.

In the embodiment shown in Figs. 4, 5, andportion 65 erence and comprising teeth unbrokenv 7 5 6 the operation of the parts is identical with the operation of the parts shown in the first embodiment; but in this form, owing to the fact that the circumferentially-interrupted change-speed gear does not have the engaging portion around its entire circumference, a greater number of pinions 10, with their cooperating parts, are required.

The driving element need not be the shaft 1, inasmuch as the same result could be obtained by attaching the power to the shaft 5. Further, while teeth are preferred for the engaging portions of the diflerent gears, owing to the positive driving connection thereby obtained, it is obvious that any other engaging surfaces may be employed.

While I have shown two embodiments of my invention in the annexed drawings, I desire it-to be understood that I am not to be cTlirTrited to the constructions here shown and that I may make any change in form, proportion, and. minor-details without departing from the spirit or sacrificing any of the advantages of my invention.

Having described my invention, what I claim is-- 1. The combination with the driving element and the driven element, of a circumferentially-interrupted gear having an engaging portion of varying diameter and earned by one of said elements, and pinions for contact with the engaging portion movable along the periphery of said gear and connected with the other element.

2. The combination with the driving element, and the driven element, of a conical circumferentially interrupted gear carried by one of the elements, and a plurality of devices for contact with the engaging portion of the gear connected with the other element and movable along the periphery of the gear.

3. The combination with the driving element, and the driven element, of a conical spirally-wound gear having teeth varying in number around the circumference of the same at different points in its length'connected with one of said elements, and a pair of pinions for engagement withthe gear, connected with the other element and movable along the peri hery of the gear.

4. The com ination with the driving element and the driven element, of a circumferentially-interrupted gear having an engaging portion of varying diameter, and connected to one of said elements, pinions for contact with the engaging portion of said gear, connected with the other element, and means for moving all of the inions in synchronism along the peri hery of the gear.

5. The com ination with the driving element, and the driven element, of a conical circumferentially-interrupted gear carried by one of the elements, pinions for contact with the gear, connected with the other element,

and means for moving the pinions along the periphery of the gear. v

6.- The combination with the driving element,- and the driven element, of a conical circumferentially-interrupted gear carried by one of the elements, pinions for contactwith the gear, connected with the other element, and means for moving all the pinions in synchronism along the periphery of the gear.

7. The combination with the driving element and the driven element, of a circumferentially-interrupted gear having an inclined. engaging portion and carried by one of the elements, a plurality of pinions for contact with the engaging portion, a screw for each of said pinions, a pinion turning with each of the screws, and a gear-wheel common to all of the pinions on the screws.

8. The combination with the driving element and the driven element, of a circumferentially-interrupted gear having an enga ing portion of varying diameter and 011,111G( by one of the elements, pinions for contact with the engaging portion, shafts on which. the

inions are adapted to slide, and connections between the shafts and the other element.

9. The combination with the driving element and the driven element, of a circumferentially-interrupted gear having an enga ing portion of varying diameter and carried by one of the elements, pinions for contact with the engaging portion, shafts on which the pinions are adapted to slide, and gearing connecting the shafts with the other element.

10. The combination with the driving element and the driven element, of a circumferentially-interrupted gear having an engaging portion of varying diameter and carried by one of the elements, pinions for contact with the engaging portion, shafts on which the pinions are adapted to slide, connections between the shaft and the other element, and means for moving all of the pinions on the shafts, in synchronism.

11. The combination with the driving element and the driven element, of a circumferentially-interrupted gear having an euga ing portion of varying diameter and carried by one of the elements, pinions for contact with the engaging portion, shafts on which the pinions are adapted to slide, connections between the shaft and the other element, and a shifter to move each of the pinions along its shaft.

12. The combination with the driving element and the driven element, of a circumferentially-interrupted gear having an enga ing portion of varying diameter and carrle by one of the elements, pinions for contact with the engaging portion, shafts on which the pinions are ada ted to slide, connections between the sha t and the other element, a shifter to each of the pinions, and means for operating all the shifters in synchronism.

i 13. The combination with the driving element and the driven element," of a cireum= ferentially-interrupted gear havin an in clined engaging portion and carrie by one of the elements, a plurality of pinions for con tact With the engaging portion, shafts on which the pinions are adapted to slide, con

nections between the shaft and the other ele' ment, a screw connected to each-of the pinions, ajpinion on each of the screws, and a singlegear for moving all the pinions in synchron1'snti.""'

14. The combination with thedriving ele-' ment and the driven element, of a circumferentially interrupted gear having an engaging portion ofvarying diameter and carrie one of the elements, pinions for contact with the engaging ortion, shafts on which the pinionsare a apted. to slide, a gear on the other element, a fixed pinion on each of the shafts meshing. with the gear on the other element, a yoke foreaeh ofthe sliding pinions,- and a shifter for each of the okes.

15. Th'ecombination with the riving ele-' ment and-the driven element, of a'circumferentially-interrupted gear having an enga ing portion of varying diameter and carri'ecf by one of the elements, pinions for contact with 'fwith the engaging portion, shafts on which anda the inions are adapted to slide, a gear on the other element, a fixed pinion on each of the shafts meshin with the gear on the other element; a yoke or each of'the sliding pinions a screwfor each of the yokes, a rigid pinion on each screw, and a gear with which all of the pinions on the screw mesh.

17. .The combination with a toothed gear I having a varying diameter, of toothed pinionsshiftable along the periphery of the gear and adagtedfor engagement with the same driven thereby.

riven member having connection with all of-said pinions to'be continuously 1 8. The'combination with a circumferentially-interrupted-conical gear, of a plurality of pinions adapted to travel] on the conical g ear'in the same path and'a driven member having connection with all of said pinions to be continuously driven thereby.

19; The combination With a circumferentially interrupted conical gear, of a plurality ofpinions adapted to travel on the conical gear in one circular path and a driven memher having connection with all of said pinions to be continuously driven thereby. 20. The combination with a circumferenti-allyinterrupted conical gear, of a plurality ofpinions adapted-to travel on the conical gear in one circular path, means for shifting the pinions to cause them to travel in other circular paths on the conical gear and a driven member havingconnection with all of said pinions to be continuously. driven there- The vforegoing specification signed this 17th day of September, 1904. 7 'RIGHARD ROSEWARNE. In presence of I FERDINAND BROERMAN, EDWIN HQFISHER. 

